Potentilla.] _ ' ROSACE.^. 



195 



Affinis P. nivetB sed certe species distincta, petalis renifomiibus facUe ab omnibus P. nive<B fonnis dis- 

 cemenda. 



Hab. Dry and elevated ridges of the Rocky Mountains, between lat 52° and 56°. Drummond. Shores 

 of the Arctic Sea. Dr. Richardson, Capt. Sir John Franklin. Islands of the Arctic Sea. Capt Sir E. 

 Parry, Capt Sahine.—Thh is a very beautiful species, with the flowei-s large in proportion to the size of 

 the plant, and the petals very broad; but I possess many specimens of a Potentilla from the higher summits 

 of the Rocky Mountains and from the Arctic regions, which appear to be quite intermodinte between P. 

 Vahliana and P. nivea. The latter has in general mu(>h smaller flowers, but A\'hich are larger freijuently 

 as the plant becomes smaller, in very arctic or very alpine situations. [//.] 



32. P, nivea; caule adscendente paucifloro, foliis ternatis, foliolis obovali-cuneiformibus 

 margine planis inciso-serratis, supra subhirsutis, subtus niveo-tomcntosis, petulls lato-obcor- 

 datis calyce pauUo longioribiis. — Linn, Sp, PL p, 715. FL Dan, t 1035. NestL Monogr. Pot. 

 p. 73. Parsli, FL Am. v. \. p. 353. Lehm. Monogr. PoL p. 184. Rich. inFrankL UtJmtm, 

 ed. 2. App. p. 20. De Cand. Prodr. v, 2. p, 572. HooL in Bot Mag, t 2982. (var. macro- 

 phylla,) — P. micrantlia et uniflora. Ledeb, {fide f^pmminnm ah ipm aitctore niecum com- 

 municatorum,) — P. Gunneri. Hartm, FL Stand, — ^, foliis utrinque villosoiusculis paginis 

 concoloribus. B7\ 



Hab. Labrador. Rev, B, Kofibneister (in Herb, nosfr.) Mountains and alpine Prairies, from Carlton- 

 House, to the Rocky Mountains, Drummond; and to the shores of the Arctic Sea (Dr. Richardson), and 

 islands of the Arctic Ocean, (Capt. Ross, Capt Sir E. Parry, Capt Sabine,) where also var. /3. is found, 

 as well as at Labrador. Dr. Morrison. — This species also, in North America, appears, in regard to the pubes- 

 cence of the whole plant, size, and number of the flowers, a very variable one. Though the size of the petals 

 is subject to many changes, it depends however on that of the calyx, in as ranch as a lai^rcr calyx has 

 always in proportion larger petals.* Another deviation from the usual state of the plant T find in the North 

 American plants of this species, namely, that sometimes (as in P. subacaulis) there are found some leaves 

 quinate : these are apparent on vigorous specimens, the flowers of which are numerous and small. In other 

 respects there iS no difference. Lehm. 



33. P. tridentata; radicc repente, caule adscendente, foliis ternatis, foliolis oblongo- 

 cuneiformibus apice tridentatis supra glabriuscidis subtus pubescentibus glaucescentibus. — 

 Ait Hort Kew, v, 2. p, 216. t 9. EngL BoL t. 2389. NestL Monogr. Pot p, 66. Pursh, 

 17, Am. V. 1. p, 353. Lehm. Monogr. Pot p. 190. BigeL Fl, Bost ed. 2. p. 205. Torrey^ 

 FL of Un. St. V. 1. p. 495. De Cand. Prodr. v. 2. p. 585.— P. retnsa. Eetz, FL Dan. t 799 



et 1875. 



Hab. Labrador. Rev. B. Kohlmeister, Dr. Morrison. Newfoundland. Sir A. Cochrane and Mr. Cor- 

 mack; in Canada, and throughout the woody cotmtry, from Lake Huron (Dr. Todd) as far as lat. 64°. Dr. 

 Richardson, Drummond. 



34. P. hiflora; caule erecto apice subbifloro, foliis ternatis tenuissime pilosis, foliolis 

 lateralibus profunde bipartitis terminali bipartito, scgmentis lincaribus intcgerrimis margine 

 ciliatis. Lehm. in ConspecL Pot. Herb. Willd. in Mag. der GeselL Sieb. Jahrg. p. 297, 

 Mmogr. Pot. p. 192. t. 20. Rich, in FrankL \st Jmirn. ed. 2. App. p. 21, 



Hab. Barren grounds, from lat. 64° to the shores of the Arctic Sea. Dr. Richardson, (in Ui Exped.) 

 Kotzebue's Sound. Lay and Collie.— Tor an accurate and full description of this species, taken from the 

 recent plant, see Dr. Richardson, loc. cit. [IT.] 



* For some fuither particulars relative to the varieties ot it 



2 B 2 



2962. 



